How To Demagnetize Metal For Welding. If there are only a few welds then the demagnetising coils can be deployed manually. The second thing and what is really happening is that you have residual delta ferrite in teh welds.
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Then switch back to DC for the remainder of the weld joint. You would detect this this a Gauss meter or a very fine iron needle not a magnet. A Magnetizer Demagnetizer tool is a device you can purchase which applies a strong enough field to change or neutralize a magnetic field.
Heavier cross sections are easier to demagnetize using DC but the process is more time consuming.
The method used to deploy the demagnetizing coils depends on the job. Place the item on a hard secure non-metallic surface and hit it sharply a few times with a hammer. I remember doing a science experiment as a kid where we used a hammer to demagnetize a steel pipe but I. A small piece of steel can be struck with a hammer to demagnetize it.